* Inference API support video

* Using mmcv.VideoReader to read video

* modify

* Reformat use yapf 0.27.0

* Add yapf style file

* update the high-level inference api

* save classes in meta data and use it for visualization

* Update README.md

* Update inference.py

* Update README.md

* Update inference.py

Added mask visualization part for inferring.

* Update README.md

* Update inference.py

* Update inference.py

convert all tabs to spaces

* Update inference.py

* Update inference.py

fix inference bug, the default keep_ratio is True...But SSD should be false

* Update inference.py

format correct

* Update inference.py

A more stable way

* Update inference.py

* Update inference.py